Thanks to its light transmitting concrete facade, the Al Aziz Mosque in Abu Dhabi changes its appearance from opaque during the day to semi-transparent at night. Calligraphy protruding from the exterior walls illuminate the site, creating a reverential aesthetic. The facade of the building, designed by APG Architecture and Planning Group , consists of 207 unique elements with Arabic letters depicting 99 different names of God with strict instructions taken from the Koran.